IS 4017 : 1992 ' ( Reaffirmed 2002 ) ( Tpr ",;rmJT) Indian Standard CARPENTER'S SQUARES - SPECIFICATION ( First Revision ) UDC 674'1'051 : 531'747 @ BIS 1992 BUREAU MANAK 1992 OF BHAVAN, INDIAN STANDARDS ZAFAR MARa 9 BAHADUR SHAH NEW DELHI 110002 i April Price Gm~p 2 Woodworking Hand Tools SectionaI Committee, PE 07 FOREWORD This Indian Standard ( First Revision > was adopted by the Bureau of Indian Standards, after the draft finalized by the Woodworking Hand Tools Sectional Committee had been approved by the Production Eng!ineering Division Council. This standard was first issued in 1967. Carpenter's squares checking trueness of an angle or flatness or/and squares and work-piece and the square. While revising this standard, assistance has been taken from za;ld bevels' issued by British Standards Institution ( BSI ). are primarily used for testing and observing if light shows between the, BS 3322 : 1980 `Carpenter's square IS 4017 : 1992 Indian Standard CARPENTERS SQUARES -SPECIFICATION (First Revision ) XSCOPE -1.1 This standard covers carpenter's square. .2 REFERENCES 2.1 The follo ing Indian Standards are necessary iadjuncts to t It" is standard: the requirements of IS No. 2103 : 1980 3179 : 1976 3510 : 1966 revision ) Title Engineer's squares ( second to Feeler gauges ( 0'03 1 mm ) ( first revision ) IS No. `280 : 1978 Title Toolmakers' flats and hieh precision surface plates " 319 : 1974 1570 (Part 2): Free_cuttina brass bars, rods and sections ( third rev&ion ) Schedules for wrought steels: 1979 Part 2 Carbon steels ( unalloyed steels ) ( first revision ) revision ) Mild steel wire for general engineering purposes ( third 3 NoMENCLATURE 3.1 For nOmenCkitwe the purpose as giVeU in of this standard, the Table 1 shall apply. 4 DIMENSIONS 4.1 The dimensions of carpenter's be as given in Table 1. square shall TabIe 1 Dimensions for Carpenter's Squares ( CZuuses 3.1 and 4.1 ) All dimensions in millimetres. v / LENGTH OF: BLADE AND. DESIGNATING SIZE +e . INNER 1 .O NOMINAL r WORKING FACE .. I I I ____-I, I , I I NT21 100 150 200 250 300 A 100 150 200 250 300 B 50 50 55 55 65 c 110 135 145 170 215 D 40 40 45 45 50 E 15 20 20 20 20 F 100 130 140 160 205 G 3 3 3 3 3 1 IS 4017 : 1992 5 HARDNESS 5.1 The blade of the carpenter's square shall be hardened and tempered to achieve hardness in the range of 418 BV to 460 HV. 6 MATERIAL 6.1 The blades shall be manufactured suitable rtecls meeting the requirements in 5 and 8. Suitable Examples : Steel 8 ACCURACY 8.1 Straightness of Working Faces ( Inner and: Outer ) and Working Edges The difference between the highest and lowest points of the working face shall not exceed an. amount equal to 0'01 mm per 10 mm of the stock length. The difference between the highest and lowest points of the blade working edge shall not exceed 0 05 mm. A typical method of test is given in Annex A. 8.2 Parallelism Edges of Working Faces and Working. from given designation 5OC4 or 55C8 of IS 1570 ( Part 2 ) : 1979. 6.2 The rivets shall be menufactured from mild steel wire ccnforming to IS 280 : 1978 or brass conforming to IS 319 : 1974. 0.3 The face plate shall be made from brass conforming to 1s 319 : 1974. The stock shall be manufactured from arty good quality seasoned wood, such as ebony ( Diospyros sp. > or rosewocd ( Dclbergia latifolia Roxb. ) and shall be free from deleterious defects and shall be The timber shall be free from straight grained. sSpwocd, decay ( rot >, insect ho!es, knots, checks, splits, warp, wanes and other defects. 6.3.1 Alternatively the stock may be made frcm malleable cast iron or suitable plastics. .`7 MANUFACTURE, FINISH 7.1 Manufacture WORKMANSHIP AND The maximum error in parallelism between the working and outer face shall not exc%ed 0'38 mm and between working edges shall not exceed 0.1 mm. When the blade is graduated the tolerance on the nominal length shall be f 1 mm at a temperature of 27°C. The positional error of the whole scale relative to the selected face shall be & 1 mm at a temperature of 27°C. A typical methcd of test is given in Annex A. p.3 Squareness 8.3.1 The inner working edge of the blade of each square shall be square to the working face of the stock, subject to a maximum tolerance equal to the 0'01 mm per 10 mm of the blade lergth when measured at the tip of the blade. ( see Fig. 1 ). A typical method of test, is given in Annex A. 8.3.2 The maximum departure from lateral squareness ( see Fig. 1 below ) of the blade of each square with reference to the working face of the stock shall not exceed an amount equal to 0'05 mm per 10 mm of the blade length when measured at the tip of the bIade. ERROR , , and Workmanship 7.1.1 All working faces and edges of the squares together with components shall be smoothly finished. When plates, tips and spacers are used they shall be smoothly finished and flush with adjacent surfaces. 7.1.2 Facing plates on wooden positively secured to the stock. stocks shall be 7.1.3 Tips and the spacers on the stock for the squares shall be positively secured to the stock. 7.2 Finish 1.2.1 Blades The blades shall be smoothly finished and shall be chemically blued or blackened or suitably protected. 7.2.2 Stocks The stocks shall be smoothly finished made of wood shall be varnished/polished. 7.2.3 Other Metal Parts Other metal anti-corrosion parts shall be treatment. given a suitable FIG. 1 ERRORIN LATERAL SQUARENESS c and if 2 IS 4017 : 1992 9 PERFORMANCE 9.1 Permanent Set TEST LizI Secure the stock firmly and flex the tip of the blade through an angle of 15" in either lateral direction for all other sizes of bevels. The blade of each bevel shall be fully extended and in line with the stock when conducting this test. No permanent set shall result on bevel blade. 9.2 Blade Security Apply a load of 4 kg on the edge of the blade at a distance of X ( JO0 mm from the stock for squares of 100 mm blade length and 150 mm from the stock for all other sizes >. The load shall fall freely on to the edge of the blade from a height of 100 mm as shown in Fig. 2. The blade and stock shall remain positively and permanently fixed after the test. 10 DESIGNATION 10.1 The Carpenter's Fra. 2 Example: TEST FOR BLADE SECURITY OF CARPENTER'SSQUARE A Carpenter's square of nominal size 100 mm shall be designated as: Carpenter's Square IS 4017 - 100. 11 MARKING 11.1 The square shall be designated by the commonly used name, nominal size and number of this Indian Standard. carpenter's square shall be legibly marked with the manufacturer's name or trade. mark and the nominal size. ANNEX A ( Chzuses 8.1, 8.2 and 8.3.1 ) METHOD OF TESTING ACCURACY A-l CHECKING THE STRAIGHTNESS OF WORKING FACES AND WORKING EDGES A-2 CHECKING THE PARALLELISM FACES AND OF WORKING EDGES OF The working faces and working edges of the squares can be tested for accuracy by bedding them evenly on the working surface of a grade B surface plate, conforming to IS 3510 : 1966 and ensuring that a feeler gauge conforming to IS 3179 : 1976 and with a thickness of the maximum tolerance as specified in 8.1. shall not pass between them and the surface plate. The parallelism of the working and outer face of a square specified in 8.2. can be checked by direct measurement. A-3 CHECKING SQUARENESS The squareness of the inner working edge of the blade of a square to its working face as specified in 8.3.1 may be checked bv comnarina it to a grade A engineers square confo;ming"to IS 2103 : 1980. 3 I Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Zndian Standards Act, I986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. Bnrean of Indian Standards BIS is a statutory institution established under the Bnrew of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyrrght be addressed to the Director ( Publications ), BIS. Revision of Indian Standards Indian Standards are issued from possession of the to BIS giving the are reviewed periodically and revised, when necessary and amendments, if any, time to time. Users of Indian Standards should ascertain that they are in latest amendments or edition. Comments on this Indian Standard may be sent following reference : Dot : No. PED 07 ( 5535 ) Amendments Issued Since Pnblication Amend No. Date of Issue Text Affected BUREAU Headquarters : OF INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 331 01 31, 331 13 75 Regional Offices : Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002 Eastern : l/14 C.I.T. Scheme VII M, V.I.P. Road, Maniktola CALCUTTA 700054 Northern : SC0 445-446, Sector 35-C, CHANDIGARH 160036 Telegrams : Manaksanstha ( Common to all Offices ) Telephone 331 01 31 331 13 75 37 86 62 53 38 43 235 0216 6 32 92 95 Southern : C.I.T. Campus, IV Cross Road, MADRAS 600113 Western : Manakalaya, E9 MIDC, Marol, Andheri ( East ) BOMBAY 400093 Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR; COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. PATNA. THIRUVANANTHAPURAM. Printed at Swatantra Bharat Press, Delhi, India i